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Forrest plots of the vacA i1/i2 association with Helicobacter pylori-related gastrointestinal diseases. (a) vacA i1 in peptic ulcer disease (PUD) and gastric cancer (GC) development; (b) vacA i2 in PUD and GC development; (c) vacA i1 in PUD development; (d) vacA i2 in PUD development; (e) vacA i1 in GC development; (f) vacA i2 in GC development.
